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Plague may have helped finish off the Roman Empire, researchers now reveal.Plague is a fatal disease so infamous that it has become synonymous with any dangerous, widespread contagion. It was linked to one of the first known examples of biological warfare, when Mongols catapulted plague victims into cities.The bacterium that causes plague, Yersinia pestis, has been linked with at least two of the most devastating pandemics in recorded history. One, the Great Plague, which lasted from the 14th to 17th centuries, included the infamous epidemic known as the Black Death, which may have killed nearly two-thirds of Europe in the mid-1300s. Another, the Modern Plague, struck around the world in the 19th and 20th centuries, beginning in China in the mid-1800s and spreading to Africa, the Americas, Australia, Europe and other parts of Asia. [In Photos: 14th-Century 'Black Death' Graveyard]....